Electric blasting cap package



1938. J. STUART, 2D

ELECTRIC BLASTING CAP PACKAGE Filed Sept. 1, 1956 3 Sheets-Sheet l FIGJ I WWWWWLB FIG.3

FIG.6

INVENTOR ATTOR Nov. 8, 1938. J $TUART' 2 2,136,031

ELECTRIC BLASTING CAP PACKAGE Fil ed Sept. 1, 1956 3 Sheets-Sheet 2 INVENTOR 0 0867; gfiuarzffl,

@MW v ATTORNEYS Nov. 8, 1938. J. STUART, 20 2,136,031

ELECTRIC BLASTING CAP PACKAGE I Filed Sept. 1, 1936 3 Sheets-Sheet 3 W13 sir s 27 Patented Nov. 8, 1938 UNETED STAES ()FFICE 2,136,031 ELECTRIC BLASTING CAP PACKAGE 7 Joseph Stuart, 11, Wilmington, Del.,

Hercules Powder Company, W

assignor to ilminzt D L,

Claims.

This invention relates to an electric blasting cap package.

Electric blasting caps, comprising a blasting cap containing the customary detonating explo- 5 sive charge, a bridgewire, a'flash composition about the bridgewire, and lead wires extending without the blasting cap, have long been known. Heretofore, various methods of coiling or folding the more or less lengthy lead wires have been employed, for example folding back and forth into a bundle about the blasting cap, coiling the wires into a helical coil about the cap, etc.

In the folded or coiled lead wires heretofore employed there is the attendant disadvantage, in the use of the electric blasting caps, that when the lead wires are pulled out of the folded bundle, or pulled off the end of the helical coil, the lead wires become crossed, rendering it diflicult to keep the two lead wires separate from one another and difficult to trace each wire when making electrical connections of the caps in series or multiple to the firing line.

Prior methods of folding or coiling the lead wires of electric blasting caps are shown in United States Letters Patent 1,631,756 to Olin, 1,698,962 to Olin et al., 1,856,103 to Lickle, 1,903,302 to Stuart, and 1,929,911 to Barab. When pulling the pair of lead wires from the package disclosed in each of the above patents, the lead wires will be found to be crossed one over the other and difiicult to trace and connect to firing lines or to one another.

I have found that, by coiling or folding lead wires of electric blasting caps in a particular manner, hereinafter more fully described, this disadvantage of crossing and confusion of the pair of lead wires is completely avoided, and the lead wires will be pulled off the blasting caps or the blasting cap pa'ckage parallel to one another, rendering it quite simple and easy to make connections of electric blasting caps in series, in multiple, or to the firing line.

In accordance with this invention, the lead wires of an electric blasting cap are crossed, one over the other, during the coiling or folding thereof, in such a manner as to counteract or i counterbalance the crossing of the lead wires naturally encountered otherwise when pulling said lead wires not so crossed in the coiling or winding thereof.

Various shapes and forms .of coiling or folding of the pair of lead wires of electric blasting caps may be used in accordance with this invention, all as is hereinafter more fully disclosed.

Referring now to the accompany drawings,

which illustrate the improved method of coiling or folding lead wires of blasting caps in accordance with my invention, Figure 1 represents an elevation of a helically wound pair of lead wires embodying one form of my invention, Figure 2 a plan view of Figure 1, and Figure 3 of the pair of lead wires as they appear when pulled off the end of the coiled lead wires. Figure 4 represents an elevation of a helically wound pair of lead wires of the old art, Figure 5 a plan view of Figure 4, and Figure 6 the pair of lead wires as they appear, crossed, when pulled off the end of the coiled lead wires of the device of Figures 4 and 5.

Figure '7 is an elevation of a modification of the device of Figure 1, in which a protective sleeve is placed over the coil, and Figure 8 a plan view of the device of Figure 7. Figure 9 is an elevation of a modification of the device of Figure 1, in which a core is placed within the coil, and Figure 10 is a plan view of the device of Figure 9.

Figure 11 is a plan view of loosely wound lead wires, as shown in elevation in Figure 12, which may be pressed together into a compact bundle, as represented in Figure 13, about which a binder, e. g., a sleeve may be placed to retain the wire bundle in shape.

Referring now particularly to Figure 1 'of the accompanying drawings, I represents the pair of lead wires, crossed over each other twice at each revolution during the winding thereof into the coil, and 2 represents the blasting cap attached to said lead wires. In Figure 2, I similarly represents the pair of lead wires, and 2 the blasting cap attached to said lead wires. Figure 3 represents the parallel pair of lead wires, 1, as they appearwhen pulled off the end of the helical coil of Figure 1 or 2.

Referring now particularly to Figures 4 and 5, l represents the pair of lead wires, wound uni.- formly and evenly, without crossing each other, into a helical coil, and 2 the attached blasting cap. Figure 6 represents the lead wires, I, appearing crossed as they are when pulled off the end of the helical coil of Figures 4 and 5.

Referring now particularly to Figures '7 and 8, I represents the lead wires, crossed during coiling as described in connection with Figures 1 and 2, 2 a blasting cap connected with said lead wires, and 3 represents an exterior, protective sleeve or tube, e. g., of pasteboard, positioned outside the I helical coil as a. protection therefor. 1

Referring now particularly to Figures 9 and 10,

l represents the lead wires, crossed during coiling as described in connection with Figures 1 and 2, 2 a blasting cap connected to said lead wires, and 4 represents a core or tube, e. g., of pasteboard, positioned within the helical coil and acting as a support therefor.

Referring now particularly to Figures 11 and 12, I represents the lead wires, crossed over each other twice each revolution, and connected to cap 2, coiled in a loose helical form, adapted to be compressed into a. bundle or fold as in Figure 13, to form an elongated bundle, over which a retaining device, e. g., pasteboard sleeve 5, may be placed.

What I claim and desire to protect by Letters Patent is:

1. An electric blasting cap package comprising lead wires and an electric blasting cap, said lead wires being coiled in pairs and the wires of each pair crossed one over the other twice each revolution.

2. An electric blasting cap package comprising lead wires and an electric blasting cap, said lead wires being coiled in pairs and the wires of each pair crossed one over the other twice each revolution, and an external sleeve positioned over said coil.

3. An electric blasting cap package comprising lead wires and an electric blasting cap, said lead wires being coiled in pairs and the wires of each pair crossed one over the other twice eachrevolution. and a supporting core positioned within said coil.

4. An electric blasting cap package comprising lead wires and an electric blasting cap, said lead wires being coiled in pairs and the wires of each pair crossed one over the other twice each revolution, and a supporting core positioned within said coil, said blasting cap being positioned within said core.

5. Anelectric blasting cap package comprising lead wires and an electric blasting cap, said lead wires being coiled in pairs and the wires of each pair crossed one over the other twice each revolution, and the coil compressed to an elongated bundle, and a protective sleeve positioned around said bundle and blasting cap. I

JOSEPH STUART, II. 

